at least two sentences, explain why the majority of the galaxies appear either red or blue in color and what that indicates about their motion, the motion of the universe and the relationship to the big bang theory
The majority of galaxies appear either red or blue in color due to a phenomenon known as redshift and blueshift. Redshift occurs when galaxies are moving away from us, causing their light waves to stretch and appear more red. On the other hand, blueshift occurs when galaxies are moving towards us, compressing their light waves and making them appear more blue. This indicates that the majority of galaxies in our observable universe are moving away from us, suggesting an expanding universe consistent with the Big Bang theory.
